put a bed on top of another—make unnecessary repetitions ❍ 他的文章翻来覆去，犹如屋下架屋～，毫无必要。His essays were full of unnecessary repetitions,and seemed as if a house were built inside another and a bed put on the top of another.
床上安床chuánɡ shànɡ ān chuánɡ
比喻不必要的重叠。duplication, make unnecessary repetitions, be a copy of